Compilation on mips (big-endian 32-bit) fails with crate `std` compiled by an incompatible version of rustc

[hsivonen]

On Linux on 32-bit big-endian MIPS when trying to compile encoding_rs, I get the following error on both nightly (1.18.0-nightly (1785bca 2017-04-21)) and stable (1.16.0 (30cf806 2017-03-10)) installed via rustup:

   Compiling cfg-if v0.1.0
error[E0514]: found crate `std` compiled by an incompatible version of rustc
  |
  = help: please recompile that crate using this compiler (rustc 1.16.0 (30cf806ef 2017-03-10))
  = note: crate `std` path #1: /home/user/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd_shim-fa5d09c1de30baa9.rlib compiled by ""
  = note: crate `std` path #2: /home/user/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd_unicode-f161ec64ee07d726.rlib compiled by ""
  = note: crate `std` path #3: /home/user/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd-dfe2fc549aedc35c.rlib compiled by ""
  = note: crate `std` path #4: /home/user/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd-dfe2fc549aedc35c.so compiled by ""

error: aborting due to previous error

error: Could not compile `cfg-if`.

To learn more, run the command again with --verbose.

[nikomatsakis]

cc @brson -- any thoughts on what's going on here? Is this a rustup issue? Compiler?

[nikomatsakis]

triage: P-high

Tentatively marking as P-high. MIPS is tier 2, but it's not good for it to be horribly broken.

@hsivonen -- you're sure this is not some quirk of your install?

[hsivonen]

@hsivonen -- you're sure this is not some quirk of your install?

Pretty sure. This was right after install from rustup without messing with the rustup directories in any way manually.

(The underlying system I used is quirky: Debian Wheezy with Rust-compatible glibc transplanted from Jessie, but I have a hard time seeing how that could result in the error seen here.)

[nagisa]

Can only reproduce on stable (meaning it should be fixed on master, already?):

nagisa@debian:~/encoding_rs-master$ cargo build
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading cfg-if v0.1.0
   Compiling cfg-if v0.1.0
   Compiling encoding_rs v0.6.2 (file:///home/nagisa/encoding_rs-master)
    Finished dev [unoptimized + debuginfo] target(s) in 533.65 secs
nagisa@debian:~/encoding_rs-master$ uname -a
Linux debian 3.16.0-4-4kc-malta #1 Debian 3.16.39-1 (2016-12-30) mips GNU/Linux
nagisa@debian:~/encoding_rs-master$ rustc --version
rustc 1.18.0-nightly (94e884b63 2017-04-27)
nagisa@debian:~/encoding_rs-master$ cargo +stable build
   Compiling cfg-if v0.1.0
$<2>error[E0514]$<2>$<2>: found crate `std` compiled by an incompatible version of rustc$<2>
  $<2>$<2>|$<2>
  $<2>$<2>= $<2>$<2>help$<2>: please recompile that crate using this compiler (rustc 1.17.0 (56124baa9 2017-04-24))$<2>
  $<2>$<2>= $<2>$<2>note$<2>: crate `std` path #1: /home/nagisa/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd_unicode-cfbd6648f7db2ee5.rlib compiled by ""$<2>
  $<2>$<2>= $<2>$<2>note$<2>: crate `std` path #2: /home/nagisa/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd-f4594d3e53dcb114.rlib compiled by ""$<2>
  $<2>$<2>= $<2>$<2>note$<2>: crate `std` path #3: /home/nagisa/.rustup/toolchains/stable-mips-unknown-linux-gnu/lib/rustlib/mips-unknown-linux-gnu/lib/libstd-f4594d3e53dcb114.so compiled by ""$<2>

$<2>error$<2>$<2>: aborting due to previous error$<2>

error: Could not compile `cfg-if`.

To learn more, run the command again with --verbose.

[nikomatsakis]

@hsivonen, can you verify if this is fixed on a nightly build?

[hsivonen]

rustc 1.18.0-nightly (128aa26 2017-04-28) no longer exhibits this bug. Thanks!

[nagisa]

Awesome!